org.sqlproc.engine
Class SqlEngine

java.lang.Object
  org.sqlproc.engine.SqlEngine

Direct Known Subclasses:

SqlCrudEngine, SqlProcedureEngine, SqlQueryEngine

public abstract class SqlEngine
extends Object

Common ancestor for SqlQueryEngine and SqlCrudEngine.

For more info please see the Tutorials.

Author:

Vladimir Hudec

Field Summary

protected Map<String,Object>	features Configuration of the SQL Processor using map of features.
protected org.slf4j.Logger	logger The internal slf4j logger.
protected SqlMappingRule	mapping The pre-compiled mapping rule, which is an SQL execution result to Java output classes mapping prescription.
protected SqlMonitor	monitor Monitor for the runtime statistics gathering.
protected String	name Name of the META SQL query or statement, which uniquely identifies this instance.
protected SqlPluginFactory	pluginFactory The factory for the SQL Processor plugins.
protected SqlMetaStatement	statement The pre-compiled META SQL query or statement.
protected SqlTypeFactory	typeFactory The factory for the META types construction.

Constructor Summary

SqlEngine(String name, SqlMetaStatement statement, SqlMappingRule mapping, SqlMonitor monitor, Map<String,Object> features, SqlTypeFactory typeFactory, SqlPluginFactory pluginFactory)
Creates a new instance of the SqlEngine from one META SQL statement and one SQL Mapping rule instance.

Method Summary

(package private) int	getFirstResult(SqlControl sqlControl) The helper to prevent the NPE
(package private) int	getMaxResults(SqlControl sqlControl) The helper to prevent the NPE
(package private) int	getMaxTimeout(SqlControl sqlControl) The helper to prevent the NPE
(package private) Map<String,Class<?>>	getMoreResultClasses(SqlControl sqlControl) The helper to prevent the NPE
(package private) SqlOrder	getOrder(SqlControl sqlControl) The helper to prevent the NPE
(package private) Object	getStaticInputValues(SqlControl sqlControl) The helper to prevent the NPE
void	setFeature(String name, Object value) Sets the optional feature in the runtime.
void	unsetFeature(String name) Clears the optional feature in the runtime.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

logger

protected final org.slf4j.Logger logger

The internal slf4j logger.

name

protected String name

Name of the META SQL query or statement, which uniquely identifies this instance.

statement

protected SqlMetaStatement statement

The pre-compiled META SQL query or statement. The META SQL is an ANSI SQL extension using the ANTLR defined grammar.

mapping

protected SqlMappingRule mapping

The pre-compiled mapping rule, which is an SQL execution result to Java output classes mapping prescription.

features

protected Map<String,Object> features

Configuration of the SQL Processor using map of features. Optional features can alter the SQL Processor runtime behavior.

monitor

protected SqlMonitor monitor

Monitor for the runtime statistics gathering.

typeFactory

protected SqlTypeFactory typeFactory

The factory for the META types construction. The META type defines the mapping between a Java class type and a JDBC datatype. For the default META type factory, please see JdbcTypeFactory .

pluginFactory

protected SqlPluginFactory pluginFactory

The factory for the SQL Processor plugins. This is the basic facility to alter the SQL Processor processing.

Constructor Detail

SqlEngine

public SqlEngine(String name,
                 SqlMetaStatement statement,
                 SqlMappingRule mapping,
                 SqlMonitor monitor,
                 Map<String,Object> features,
                 SqlTypeFactory typeFactory,
                 SqlPluginFactory pluginFactory)

Creates a new instance of the SqlEngine from one META SQL statement and one SQL Mapping rule instance. Both parameters are already pre-compiled instances using the ANTLR parsers. This is the recommended usage for the runtime performance optimization. This constructor is devoted to be used from the SqlProcessorLoader, which is able to read all statements definitions from an external meta statements file and create the named SqlEngine instances. Also an external SQL Monitor for the runtime statistics gathering can be engaged.

Parameters:

name - the name of this SQL Engine instance

statement - the pre-compiled META SQL statement

mapping - the pre-compiled SQL mapping rule

monitor - the SQL Monitor for the runtime statistics gathering

features - the optional SQL Processor features

typeFactory - the factory for the META types construction

pluginFactory - the factory for the SQL Processor plugins

Method Detail

setFeature

public void setFeature(String name,
                       Object value)

Sets the optional feature in the runtime.

Parameters:

name - the name of the optional feature

value - the value of the optional feature

unsetFeature

public void unsetFeature(String name)

Clears the optional feature in the runtime.

Parameters:

name - the name of the optional feature

getStaticInputValues

Object getStaticInputValues(SqlControl sqlControl)

The helper to prevent the NPE

Parameters:

sqlControl - the compound parameters controlling the META SQL execution

Returns:

the object used for the SQL statement static input values

getMaxTimeout

int getMaxTimeout(SqlControl sqlControl)

The helper to prevent the NPE

Parameters:

sqlControl - the compound parameters controlling the META SQL execution

Returns:

the max SQL execution time

getFirstResult

int getFirstResult(SqlControl sqlControl)

The helper to prevent the NPE

Parameters:

sqlControl - the compound parameters controlling the META SQL execution

Returns:

the first SQL execution output row

getMaxResults

int getMaxResults(SqlControl sqlControl)

The helper to prevent the NPE

Parameters:

sqlControl - the compound parameters controlling the META SQL execution

Returns:

the max number of SQL execution output rows

getOrder

SqlOrder getOrder(SqlControl sqlControl)

The helper to prevent the NPE

Parameters:

sqlControl - the compound parameters controlling the META SQL execution

Returns:

the ordering directive list

getMoreResultClasses

Map<String,Class<?>> getMoreResultClasses(SqlControl sqlControl)

The helper to prevent the NPE

Parameters:

sqlControl - the compound parameters controlling the META SQL execution

Returns:

more result classes used for the return values